Yes, you can add notes to the photo front and it works exactly the way the back of photo note works. From Gallery, select your photo then pull up the menu (left key on phone). Choose edit instead of photo note. A new menu will open along the bottom of the photo and on my phone I see the choices "rotate, crop, color, effect" If you swipe the menu to the left, four more choices arrive: "portrait, sticker, drawing, frame." Careful, you may find yourself playing for half an hour with all these things! Anyway, select Drawing then the remaining steps are just like photo note except on the picture front.
When you are finished and hit save, Gallery will automatically save a copy of the original so you have one with the note and one without.